1. and 1919 Textbook of Histology. 2nd Ed., Section on microscopic technic, pp. 17-57. W. B. Saunders Co., Philadelphia.
2. Buchanan's Manual of Anatomy. 1927 Chapt. 12, vol. 2, pp. 986-1114. C. V. Mosby Co., St. Louis.
3. Beiträge zur Entwicklungsgeschichte des Säugethierherzens
4. 1927 Development of the human heart from its first appearance to the stage found in embryos of twenty paired somites. Carnegie Inst. Contrib. to Embryol., vol. 19, no. 107, pp. 245-284.